Titanium was discovered by William Gregor in 1791 (Great Britain) [1]. Pure titanium was obtained after a long struggle of 119 years, by Matthew Hunter in 1910.Titanium was used for the first time in making military applications by Soviet Union in 1950s. And later, US defense department recognized the significance of titanium and set motion to commercialization of titanium-based war strategic material. The element was name Titanium after the Greek Gods, Titans by Martin Klaproth.
| Periodic Table Classification | Group 4 Period 4 |
|---|---|
| State at 20C | Solid |
| Color | Silvery grey-white metallic |
| Electron Configuration | [Ar] 3d2 4s2 |
| Electron Number | 22 |
| Proton Number | 22 |
| Electron Shell | 2, 8, 10, 2 |
| Density | 4.54 g.cm-3 at 20°C |
| Atomic number | 22 |
| Atomic Mass | 47.87 g.mol -1 |
| Electronegativity according to Pauling | 1.54 |
Titanium is an abundant element and is characterized as the 9 th most abundant element in the Earth’s crust [2]. Native or elemental titanium is very rare. It exists in form of compounds in minerals. Mostly, it is present as oxides in igneous rocks and sediments. The common minerals of titanium include brookite, sphene (calcium titanium silicate), perovskite, titanite, anatase and rutile (titanium oxide). The minerals of economic importance are ilmenite (iron titanium oxide) and rutile, and around 0.7 million tons were mined in 2011Titanium is also present in ocean water with a concentration of around 4 picomoles [3]. Titanium is present in extraterrestrial environment, including the sun, moon, meteorites and certain type of stars. The main producers of titanium include India, US, New Zealand, China, Canada, South Africa and Norway.
Titanium is a silvery white lustrous metal. it is quite light-weight as compared to other metals. it has an outstanding strength and durability. Titanium is highly resistant to corrosion. The rate of corrosion of titanium is so slow that it will be barely rusted after 4000 years of sea water exposure. When heated, titanium is ductile and malleable. Titanium is insoluble in water. however, it is readily dissolved in concentrated sulfuric and nitric acids.
Titanium exists in two oxidations states, +4 and +3. The most common oxidation state of titanium in compounds is +4 [4]. the titanium (IV) compounds are usually termed as titanates. Titanium frequently forms covalent bonds with its compounds. Titanium form titanium oxides with oxygen, and there are three forms of titanium oxide, rutile, anatase and brookite. Titanium forms compound with sulfur.
Titanium is a low toxic metal. However, certain compounds including titanium chlorides are quite corrosive. In powder from, titanium is readily combustible.
There are eighteen isotopes of titanium. There are five stable isotopes present in naturally occurring titanium: titanium-46, titanium-47, titanium-48, titanium-49, and titanium-50. The most abundant natural isotope is titanium-48 (73.8%). There are also eleven radioactive isotopes of titanium and among them titanium-44 is the most stable. The radioactive isotopes of titanium emit gamma rays and positrons.
[1]. William Gregor, Beobachtungen und Versuche über den Menakanite, einen in Cornwall gefundenen magnetischen Sand., in Lorenz Crell’s Chemische Annalen, 1791, p40
[2]. Barksdale 1968, p. 732
[3]. “Titanium”. Encyclopædia Britannica. 2006. Retrieved 29 December 2006.
[4]. Greenwood 1997, p. 970
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